<?php
/*
* 2007-2012 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Open Software License (OSL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/osl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2012 PrestaShop SA
*  @version  Release: $Revision: 14733 $
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

abstract class Db extends DbCore
{
	/**
	 * Add SQL_NO_CACHE in SELECT queries
	 * 
	 * @var unknown_type
	 */
	public $disableCache = true;

	/**
	 * Total of queries
	 *
	 * @var int
	 */
	public $count = 0;

	/**
	 * List of queries
	 *
	 * @var array
	 */
	public $queries = array();
	
	/**
	 * List of uniq queries (replace numbers by XX)
	 * 
	 * @var array
	 */
	public $uniqQueries = array();
	
	/**
	 * List of tables
	 *
	 * @var array
	 */
	public $tables = array();

	/**
	 * Execute the query and log some informations
	 *
	 * @see DbCore::query()
	 */
	public function query($sql)
	{
		$uniqSql = preg_replace('/[0-9]+/', '<span style="color:blue">XX</span>', $sql);
		if (!isset($this->uniqQueries[$uniqSql]))
			$this->uniqQueries[$uniqSql] = 0;
		$this->uniqQueries[$uniqSql]++;

		// No cache for query
		if ($this->disableCache)
			$sql = preg_replace('/^select /i', 'SELECT SQL_NO_CACHE ', trim($sql));

		// Get tables in quer
		preg_match_all('/(from|join)\s+`?'._DB_PREFIX_.'([a-z0-9_-]+)/ui', $sql, $matches);
		foreach ($matches[2] as $table)
		{
			if (!isset($this->tables[$table]))
				$this->tables[$table] = 0;
			$this->tables[$table]++;
		}

		// Execute query
		$start = microtime(true);
		$result = parent::query($sql);
		$end = microtime(true);
		
		// Save details
		$timeSpent = $end - $start;
		$trace = debug_backtrace(false);
		while (preg_match('@[/\\\\]classes[/\\\\]db[/\\\\]@i', $trace[0]['file']))
			array_shift($trace);
		
		$this->queries[] = array(
			'query' => $sql,
			'time' => $timeSpent,
			'file' => $trace[0]['file'],
			'line' => $trace[0]['line'],
		);
		
		return $result;
	}
}